聚醚型非离子表面活性剂的混合表面膜 Ⅱ.环氧乙烷环氧丙烷共聚物与异辛基苯酚聚氧乙烯加成物和聚丙二醇的混合膜

Mixed Monolayers of Polyether-Type Nonionic Surfactants II. Binary Mixtures of Polyoxyethylene-Polyoxypropylene Polyols, Polyoxyethylated iso-octylphenols and Polypropylene Glycol

在研究了聚醚型非离子表面活性剂在水面上所成表面膜和在油水界面上所成吸附膜的行为的基础上,我们曾开展了混合表面膜的研究。本文进一步测定了环氧乙烷环氧丙烷共聚物与异辛基苯酚聚氧乙烯加成物和聚丙二醇的等分子混合物在40％NaNO_3水溶液表面上所成膜的表面压(π)-分子面积(α)关系。结果表明组成混合膜的两种组分可能形成了完全混溶的二维溶液。

The film pressure vs. area isotherms of polyoxyethylated iso-octylphenols (Triton X-100, Triton X-305), polyoxyethylene-polyoxypropylene polyols (L61 and F68), and polypropylene glycol and their binary mixtures on the surface of 40% NaNO_3 aqueous solution have been determined at 20℃. The experimental π-a curves of mixed monolayers indicate some different kinds of deviations from calculated average curves based on simple additivity rule. The results are interpreted in terms of the thermal motions of hydrocarbon chains and of polypropylene oxide chains if it had been squeezed out of the water surface, and the model which permits the polyoxyethylene oxide chain partly lies in the interface and partly penetrates the water phase. From the analysis of the compression curves of the mixed monolayers, it can be concluded that in all of mixed monolayers in this work the two components are miscible with each other and form two-dimensional solutions not far from ideal.